<?php

/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Gdata
 * @subpackage Gdata
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: HttpAdapterStreamingSocket.php 16971 2009-07-22 18:05:45Z mikaelkael $
 */

/**
 * @see Zend_Http_Client_Adapter_Socket
 */
require_once 'Zend/Http/Client/Adapter/Socket.php';

/**
 * Extends the default HTTP adapter to handle streams instead of discrete body
 * strings.
 *
 * @category   Zend
 * @package    Zend_Gdata
 * @subpackage Gdata
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Gdata_HttpAdapterStreamingSocket extends Zend_Http_Client_Adapter_Socket
{

	/**
	 * The amount read from a stream source at a time.
	 *
	 * @var integer
	 */
	const CHUNK_SIZE = 1024;

	/**
	 * Send request to the remote server with streaming support.
	 *
	 * @param string        $method
	 * @param Zend_Uri_Http $uri
	 * @param string        $http_ver
	 * @param array         $headers
	 * @param string        $body
	 * @return string Request as string
	 */
	public function write($method, $uri, $http_ver = '1.1', $headers = array(),
	$body = '')
	{
		// Make sure we're properly connected
		if (! $this->socket) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception(
                'Trying to write but we are not connected');
		}

		$host = $uri->getHost();
		$host = (strtolower($uri->getScheme()) == 'https' ? $this->config['ssltransport'] : 'tcp') . '://' . $host;
		if ($this->connected_to[0] != $host || $this->connected_to[1] != $uri->getPort()) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception(
                'Trying to write but we are connected to the wrong host');
		}

		// Save request method for later
		$this->method = $method;

		// Build request headers
		$path = $uri->getPath();
		if ($uri->getQuery()) $path .= '?' . $uri->getQuery();
		$request = "{$method} {$path} HTTP/{$http_ver}\r\n";
		foreach ($headers as $k => $v) {
			if (is_string($k)) $v = ucfirst($k) . ": $v";
			$request .= "$v\r\n";
		}

		// Send the headers over
		$request .= "\r\n";
		if (! @fwrite($this->socket, $request)) {
			require_once 'Zend/Http/Client/Adapter/Exception.php';
			throw new Zend_Http_Client_Adapter_Exception(
                'Error writing request to server');
		}


		//read from $body, write to socket
		$chunk = $body->read(self::CHUNK_SIZE);
		while ($chunk !== FALSE) {
			if (! @fwrite($this->socket, $chunk)) {
				require_once 'Zend/Http/Client/Adapter/Exception.php';
				throw new Zend_Http_Client_Adapter_Exception(
                    'Error writing request to server');
			}
			$chunk = $body->read(self::CHUNK_SIZE);
		}
		$body->closeFileHandle();
		return 'Large upload, request is not cached.';
	}
}
